Oil-feeding mechanism for oil burners



Jan. 10, 1928.

1,655,506 E. MARR OIL FEEDING MECHANISM FOR OIL BURNERS Filed July 5. 1926 s Sheets-Sheet 1 E01] Mar] Jan. 10, 1928.

E. MARR OIL FEEDING MECHANISM FOR OIL BURNERS Filed July 5. 1926 3 Sheets-Sheet 2 "Patented 10, 1928.

u ITED' STATES PATENT OFFICE.

um mm, or rninapntrnm, rnnnsrnv'lmmynssienon r mm OIL nm'r uacnmn CORPORATION, or mmnnaroms, MINNESOTA, a conromrro'n or SOUTH JDAKOTA.

OIL-FEEDTNG MECHANISM FOR OIL IB'URNERS.

Application filed July 5,

My present invention rela particularly to oil burners and has forits' bject to provide highly eflicient and reliable means for supplying the oil orfiuid fuel thereto. Generally stated, the invention consists of the noveldevices, combinations of devices, and.

. arrangement of parts hereinafter described and defined in theclaims.

A commercial form of the improved mechanism is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring .to the drawings Fig. 1 is a plan view of the some parts being broken away;

Fig.2 is an end elevation of the parts shown in Fig. 1;

\ Fig. 3 is a fragmentary View partly in elevation and partly in section on the line 3-3 of Fig. 1; a a

Fig. 4 is a section on the line H of Fig. 3;

Fig. 5 is a vertical section on the line 5-5 of Fig. l; I

T Fig. 6 is a fragmentary view partly in plan but chiefly in horizontal section on the. line6- 6ofFig.5;and' k "Fig. 7 is a transverse vertical section taken on the line 77 of Fig. 5. S0

mechanism,

In accordance with this 1nvention,.the oil or. fluid fuel will be conducted from a source of supply, such as a main supply tank set into the ground, preferably outside of the building in. which the burner is installed, 86 through a main oil supply pipe 8'that leads to a pump 9, which, in turn, delivers through a pipe 10 to-an auxiliary oil'supply tank 11 that is' located above the main supply tank.

'In the pipe 8, there is preferably interposed 4 a cut-off valve 12 and a strainer 13. The pump 9 openatesas a primary pump and while it may be of any suitable type, ispreferably of the rotary type and, advisably, is of the rotary gear type exemplified in a cooperating secondary pump presently to be described more in detail. At this point, it is only desirable to further state that the rotor of the pump 9 iscarried by a shaft 14, which' latter directly drives the secondary B0 pump and a centrifugal governor, the structure and function of which will hereinafter be considered, 1

' The casing of the pump 9 has a flanged 1926. Serial in. 120,450.

base that isbolted or otherwise rigidly se- 7 cured on a bed casting 15, to which latter) base casting 15. The casting or member 21 v is also formed with a portion that tele- Scopes into and forms a head for a shell 23 that constitutes an oil container and affords a housing for a centrifugal governor presently to be described. The pump-driven shaft 1 1, which will be driven from a suitable source of power, preferably an elec:

tric motor mounted on the" base casting 15, is extended from the-pump 9 through the pump casing 19 and head-forming members 20 and 21 and projects into the oil container 23.

The pump gear 17 is directly secured to and driven by the shaft '14, and here it may be more definitely stated that said shaft 14 is connected to a corresponding gear of the primary pump 9. An oil pipe 24 extends from the lower portion of the auxiliary tank 11 to the receiving port 25 of the secondary pump, and which port is formed in the pump casing 19, as best. shown in Fig. 7. The discharge port 26 of said secondary pump, which is also formed in the casing 19, is connected to a port 27 that leads through the head-forming member 21 to the interior of the oil' container 23, (see particularly Figs. 5 and 7). --The delivery side of said secondary pump is connected back to the auxiliary tank 11 by a return 'pipe 29. The pipe 29 is shown as made in two sections connected through a ,valve casing 30 having'a port 31 normallyclosed by a pressure-opened springseated valve 32, (see Fig. 4:). This valve 32 is normally closed by a coiled spring 33 that is made adjustable by a plug 34. screwed into the upper end of a sleeve 35, the lower end of which is threaded into the valve casing 30.

The numeral36 indicates a removable cap ence to which it will be is connected to the port 27 by a port 37, which latter port is shown in Fig. 5. The numeral 38 indicates a pressure gauge connected to the receiving section of the return pipe 29 by a branch pipe 39. The numeral 40 indicates an overflow pipe that extends from the top of the auxiliary tank 11 and leads back to the main tank or source of supply.

At its extended portion, the oil container 23 is shown as formed with an axially projecting sleeve 41 into which is screwed a tubular member 42, which, at its receiving end, is formed with a capillary or very small oil-discharge passage 43, (see Figs. 5 and 6), that flares toward the interior of the oil container as indicated and constitutes a coni cal valve seat 44. This capillary oil passage 43 is intended to give a restricted flow of oil to the burner and it delivers through the tubular member 42 to a final oil delivery pipe 45, which latter extends to the burner, not shown. As shown, a normally open valve 46 is interposed in the pipe 45.

Mounted to slide and to rotate on the reduced end of the pump shaft 14 is a sleeve 47, the end of which is made conical to afl'ord a conical choke valve 48'arranged to closely engage the valve seat 44 and to open and close the restricted oil passage 43. Located within the oil container 23 and secured to and rotatable to pump shaft 14 is a cuplike member 49. A coiled spring 50 surrounds the shaft 14 and reacts at one end against the cup 49 and at its other end against a washer 51 which, in turn,is seated against a shoulder on the sleeve 47. Located 'Within the cup 49 and pivoted thereto at 52 are governor-acting members 53 in the form of weighted levers, the short ends of which engage a shoulder on the sleeve 47. The above noted elements 49, 50 and 53 constitute a centrifugal governor in which the weighted ends of the levers 53 act as the equivalent of the usual fly balls. To prevent the restricted oil passage 43 from becoming clogged, a fine wire 54 is set axially into the valve 48, as best shown in Figs. 5 and 6, by refernoted that when the choke valve 48 is retracted, the free end of the needle or wire 54 will be within the conical valve seat 44 and, although distorted so that it is normally out of axial alignment with the passage 43, will, by the said valve seat, be guided into the said passage when the valve is moved to a closed position indicated in Fig. 5.

Operation.

All of the running parts are driven by power applied preferably from an electric motor through the pump shaft 14. When a burner having an atomizer of the rotary type is employed, the rotary atomizer will also preferably be driven from the shaft 14.

nesaaoe Here it may be stated that this oil-feeding apparatus or device, while not limited to a specific use, has been especially designed for use in connection with oil burners of the vertical open cup rotary type, such as (llSClOf-ieti and claimed in the King Patent No. 1,158,- 058, of October 26, 1915, entitled Centrifugal burner, and in which arrangement, the atomizing cup with attached fan is indirectly driven from a small electric motor, the rotor of which will drive the pump shaft 14 and the said atomizing cup. I

When the burner is in action and the shaft 14 is driven, the oil or fluid fuel will be continuously pumped from the supply tank up and into the auxiliary tank 11. This auxiliary tank will be kept filled with oil, for the primary pump 9 will pump oil much faster than it can be burned, so that there is a continuous overflow or return of the oil from the auxiliary tank through the overflow pipe 40 back into the main tank. The secondary pump will pump oil from the auxiliary tank into the container 23 much faster than the oil can be burned and, consequently, the said container will be kept filled with oil and there will be a constant return flow of the oil from said container through the return pipe 29 and back into the auxiliary tank 11. Thus it will be seen that the auxiliary tank 11 and the container 23 will be kept filled with oil under pressure. As already stated, the pressure put upon the oil within the container 23 may be varied by adjustments of the spring 33 of the resistance valve 32, and it, of course, follows that the greater the pressure of the oil in said container, the greater will be the amount of oil forced through the restricted passage 43 when the latter is opened by movement of the choke valve 48 out of the valve seat 44 or to position shown in Fig. 6. When the pump shaft 14 has acquired a predetermined speed, the weighted ends of the governor levers 53 will be thrown outward and the choke valve will be moved from its normally closed position shown in Fig. 5 into its open position shown in Fig. 6.

When the motor is cut out and the pumps are stopped, the governor spring 50, acting on the levers 53, will automatically move the choke valve 48 into its closed position. Hence, when the burner is out of action and the pumps are idle, the choke valve 48 positively cuts off the flow of oil from the container 23 to the burner. hen the pumps are first started into action, and while they are acquiring the speed required to operate the centrifugal governor, the choke valve will, for a short interval, remain closed, thereby insuring the proper oil-feeding pressure within the container 23 at the time the choke valve is moved to open the feed passage 43.

The use ofthe two pumping circuits, the

auxiliary tank and frequently a long dis-- tance away from the auxiliary tank. In pumping 011 from the remotely located main tank to the burner through the long supply pipe, more 'or less air will become mixed with the oil, and air thus mixed with oil will cause foaming of the oil, and foaming of the oil willrender the burning action unsteady andwill sometimes cause the flame tobe puffed out. With the arrangement here illustrated and described, however, any airpumped from the main tank to the auxiliary tank will be discharged from the auxiliary tank through the overflow pipe 40 that leads from the top of said auxiliary tank.

. The top of the auxiliary tank, it will be noted, is, in this preferred arrangement, 10- cated slightly above the top of the oil co'n-' tainer 23 and the oil pipe 24 leads fromthe lower portion ofthe auxiliary tank to the .receivin side of the secondary pump, so

that on y oil free from air can possibly reach the secondary pump and container 23,

Moreover, when the pump or oil supply means is first started into 7 action, there should be a positive and certain delivery of oil to the burner as soon as the governor has acquired .sufiici'ent speed to open the chokevalve. This result is attained by the use of two pumps or duplex arrangement of pump circuits. A single pump drawing oil for a long period from a remotely located supply tank would not give thisvinstant or quick delivery of oil to the burner, for the reason that partial vacuum will be produced, resulting in an unreliable and uneven supply ofroil, especially during the initial operat on of the pump. In the arrangement described, the secondary pump supplies the 1 oil to the container through a short 1 1pe connection, which has a very slight li so that the delivery of oil from the auxiliary tank to the container free from air will be quick and reliable.

What I claim is: I

1. In a device of the-kind described, a container having inlet and discharge ports for the circulation of fluid therethrough, a'

pump having connections for delivering the fluid to said container, a choke valve for cutting olf and releasing the flow through said container',-: -a governor for actuating said choke valve, and means for simultaneously driving saidp'ump and governor.

2. A device of the kind described compris ing a container having inlet and discharge ports for the circulation of. fluid therefor simultaneously driving said pump and governor.

3. A device of the kind described comprising a container having-inlet and discharge ports for the circulation of fluid fuel there- .through, a 'fluid-fuel-containing' tank, a

pump having connections for delivering fluid fuel from said tank to said container and from the latter back to said tank, a choke valve normally closing the discharge port of said container, a centrifugal governor which when operated moves said choke valve to an open position, and means for simultaneously operating said pump and governor. V v

4. The structure defined in claim 1 in further combination with a resistance valve interposed in' the return connection between said pump and tank.

5. The structure (1 fined in claim 1 in further combination with a resistance valve interposed in the return connection between said punipand tank, and adjustable yielding. means for setting said resistance valve under different flow-resisting pressures.

6. A device of the kind described ,comprising a fluid fuel tank, a primary pump, an oil supply pipe leading to the receiving side of said primary pump, a conduit connecting the discharge side of said pump vto said tank, an overflow pipe leading from said tank, a container having ports for the circulation of fluid fuel therethrough, a secondary pump, a conduit connecting said tank to the receiving s ideof said secondary pump, said secondary pump being connected for the delivery of fluid fuel into said container, a return conduit connecting the delivery side of said pu'mp back to said tank,

.a choke valve normally closing the discharge'passage'of said container, a centrif- .ugal governor which when operated moves said choke valve into an open position, and

means for simultaneously operating said 7 primary and secondary pump and governor; I

7. The structure defined in claim, 6 in further combination .with a yielding flow-- resisting valve interposed in the return conduit between said secondary pumpand tank.

8. The structure defined in claim 6 in further combination witha yielding flowresisting valve interposed in the return con duit between said secondary pump and tank,

and, means for varying the tension'under which said flow-resisting valve may beset.

9. The structure defined in claim 1 in which said pump has a rotary element and in which said driving means includes a shaft to which said rotary pump element and said governor are connected for common rotation.

10. The structure defined in claim 1 in which said pump has a rotary element and in which said driving means includes a shaft to which said rotary pump element and said governor are connected for common rotachoke valve normally closing the discharge said primary 1 pump, a supply pipe extending port of said container, a centrifugal governor which when operated moves said choke valve. to an open position, and means for simultaneously operating said pump and governor, in combination with a primary from a source of supply to the receiving side of pump, a conduit connecting the delivery side of said primary pump to said fluid-fuel-containing tank, and an overflow pipe extended from said tank for the return of surplus fluid to the source of supply.

12. A device of the kind described comprising a container having inlet and discharge ports for the circulation of fluid fuel therethrough, a fluid-fuel-containing tank, a pump having connections for delivering fluid fuel from said tank to said container and from the latter back to said tank, a choke valve normally closing the discharge port of said container, a centrifugal governor which when operated moves said choke valve to an open position, and means for simultaneously operating said pump and governor-fin combination with a primary pump, a supply pipe extending from a source of supply to the receiving side of said primary pump, a conduit connecting the delivery side of said primary pump to said fluidfuel-containing tank, and an overflow pipe extended from said tank for the return of surplus fluid to the source of supply, said primary and secondary pumps having r0- tary elements connected for common rotation.

13. The structure defined in claim 11 in further combination with a yieldingly closed flow-resisting valve interposed in the connection between the first noted pump and said tank.

In testimony whereof I affix my signature.

EARL MARR. 

